Steam-engine.



PATENTED JUNE 2, 1903.

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No. 729,997. v PATENTED JUNE 2, 1.903.

P. s. BOSTWIGK.

STEAM ENGINE. APPLICATION FILED MAY 5, 1902. I

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PATENTED JUNE 2, 1903'.

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P. s. BOSTWIGK.

STEAM ENGINE. APPLIOATION FILED MAY 5.1902.

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UNITED STATES Patented June 2, 1903.

PATENT OFFICE.

ls TEA'M -E Me n SPECIFICATION forming part ofletters Patent No. 729,997, dated June 2, 1903.

' Applieation'filed May 5. 1902. Serial u 105.983. on model.)

To on whom it Mai/concern.-

Be it known that I, PAUL S. BOSTVVICK, a citizen of the United States, and a resident of Woodbine, in the county of Harrison and State of Iowa, have invented a new and Improved Steam-Engine, of which the followingis a full, clear, and exact description.

The object of the invention is to provide a new and improved steam-engine which is simple and durable in construction, very eifective in operation, easily reversed, and arranged to utilize the power developed in the cylinder to the fullest advantage in transmitting the power to the main shaft without producing dead-center positions and dispensing entirely with the use of a pitrnan and crank on the main shaft.

The invention consists of certain parts and details and combinations'of the same, as will be fully described hereinafter and then pointed out in the claims.

A practical embodiment of my invention isrepresented in the accompanying drawings, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of the improvement. Fig. 2 is aplan View of. the' same. Fig. 3 is an enlarged longitudinal sectional elevation of the main cylinder, the holding mechanism for the endlesstransmissionbelt, and the actuating device for the hold ing mechanism. Fig. t is'a sectional plan view of the actuating device for'the hold ing mechanism, the section being taken on the line 4: 4 of Fig. 3. Fig. 5 is a transverse section of the same on the line 5 5 of Fig. 4. Fig. 6 is a similar view of the same with the parts in a difierent position. Fig. 7 is an end view of the cross-head and the holding device for the endless belt, the latter being shown in section. Fig. 8v is a sectional side elevation of a modified form of the holding device for the endless belt, and Fig. 9is an inverted sectional plan view of the same on the line 9 9 of Fig. 8.

The engine is mounted on a suitably-constructed frame A, supporting the main cylinder B, having cylinder-ports a and 1) leading to the steam-chest 0, containing the usual valve, (not shown,) actuated from the main shaft D of the engine by a suitable mechanism, suchas an eccentric E or the like, to controlthe admissionv and exhaust of the motive .agent to and from the cylinder B in the usual nately engaging the runs of an endless belt,

rope, or cable J, passing over. a drum or double pulley K, secured on the main shaft D. The endless belt J also passes over'idlers L and L, of which the idler -L is held adjust ably on the main frame A (see Figs. 1 and 2) to give the desired tensiontothe endless belt 'Jto prevent the latter from slipping "on the drum or double pulley K. The other idler L is journaled at the outer end of the main cylinder B and is arranged to direct the runs of the belt J between the sides of the cross-head H for the runs to be alternately engaged by the holding devices I and I to impart a continuous traveling motion to said endless belt when the engine is running, as hereinafter morefully described. Guide-rollers L journaled-on the main frame A, guide the runs of the beltJ to and between the sides of the cross-head Hat the forward end of the engine.

The holding devices I and I are actuated by the motive age'nt'pas'sing into the main cylinder 13, and for this purpose the follow- :ing device is provided: The main piston-rod G is formed with longitudinally-extending channels 0 d, opening into the cylinder B at opposite sides of the piston F, (see Fig. 3,) and the outer ends of said channels 0 and d open into the valve-casing N of a valve N for controlling the admission of the motive agent to an auxiliary cylinder 0, containing an auxiliary piston P, having its piston-red P extending in the'cross-head H,'saidvalvecasing N and cylinder 0 forming a connecting portion between the" main piston-rod G and the cross-head H, as will be readily understood by reference to' Fig. 3. The valvecasing N is connected by cylinder-ports e and fwithv the ends of the cylinder 0, as is plainly indicated in Fig. 4, so that the steam passes into said cylinder to impart a recip:

rocating motion to the piston P and its pis- 'IQO ton-rod P whenever the main piston reaches the ends of its stroke. On the auxiliary piston-rod P is secured a cross-head Q, connected by links Q and Q with levers R R, fulcrumed on the cross-head H, the lever B being connected by links R R with sets of jaws 1 l fulcrumed on the cross-head H and adapted to engage and disengage the upper run of the endless belt J. The other lever, R, is pivotally connected by the links R 11 with a set of jaws I and I likewise fulcru med on the cross-head H and adapted to engage and disengage the lower run of the endless belt J as the latter passes through the cross'head H. Now by reference to Fig. 3 it will be seen that when the auxiliary piston P moves in one direction the set of jaws I I is moved in clamping engagement with the upper run J, while at the same time the set of clamping-jaws I I is moved out of engagement with the lower run of the belt J, and as the cross-head H now travels in the direction of the arrow a it is evident that the upper run of the endless belt J is moved in the same direction, while the lower run of the endless belt passes loosely through the said cross-head and the jaws I 1 When the motion of the auxiliary piston P is reversed, the jaws I I engage the lower run of the endless belt J, so as to lock this run to the cross-head H, while at the same time the jaws 1 I move out of engagement with the upper run of the belt J, and as at this time the cross-head H moves in the inverse direction of the arrow a it is evident that another impulse is given to the endless belt J by the jaws T 1 locking the lower run of the belt to the cross-head H. When the several parts are in the position illustrated in Figs. 3, 4, and 5, the main piston F is on the outward strokethat is, in the direction of the arrow a-and the steam passing into the inner end of the cylinder B to move said main piston F in the outward direction also passes through the channel 1) into the valve-casing N and by way of the valve N is directed to the port f and to hold the jaws I I out of engagement with the lower run of the endless belt J. Now when the main piston F reaches the end of its outward stroke and steam passes into the cylinder B through the port a to press the piston F on the return strokethat is, in the inverse direction of the arrow a-then part of this steam passes through the channel c, the valve N, and the port 6 into the cylinder 0 to push the piston P in the inverse direction of the arrow at and cause the jaws 1 I to release the upper run of the endless belt J and also to cause the jaws I I to grip the lower run of the endless belt, and thus lock this lower run to the cross-head H. As the cross-head H moves in unison with the piston F and the holding devicesI and I are alternately actuated to lock the runs of the endless belt J alternately to the cross-head H, it is evident that a continuous traveling motion is given to the endless belt J to rotate the drum or pulley K in one direction, thus rotating the main shaft D.

The valve N is preferably made cylindrical and extends in about the middle portion of the valve-casing N, and in the peripheral face of said valve are formed ports g, h, and t', opening alternately into the valve-casing N at opposite sides of the valve N, as will be readily understood by reference to Figs. 4, 5, and 6. When the several parts are in the positions shown in Figs. 3, 4, and 5, then the port g is in register with the channel d to conduct the live steam from the channel d through the port g into the end of the valvecasing N, connected with the port], so that the steam can pass into the cylinder 0 at the forward end to press the piston P in the direction of the arrow at. The exhaust on the other side of the piston P now takes place through the cylinder 0, the port e, and the valve-casing N, and the port it registers with the channel 0, leading to the exhaust end of the cylinder 13. Now the motive agent passes into the outer end of the cylinder B by way of the port a, a portion of the motive agent passing through the channel a and the port h into the valve-casing N and through the port 6 into the cylinder 0 to move the piston P in the reverse direction, the exhaust on the other side of the piston now taking place through the port f, the casing N, the port g, and the channel d, opening into the exhaust end of the cylinder B.

When it is desired to reverse the engine, the valve N is turned so as to bring the port hinto register with the channel 61 and'the port i into register with the channel a to cause the live motive agent to travel in the reverse direction from the cylinder B into the auxiliary cylinderO and to cause the piston P therein to move in the reverse direction to the piston IIC F, so that the holding devices I and I are alternately actuated to clamp and release the lower and upper runs of the endless belt J alternately to cause said belt to travel in the inverse direction of the arrow a. The valve N is provided with heads N and N to prevent leakage of the steam. (See Figs. 4, 5, and 6.) In order to impart the desired reversing motion to the valve N, I provide one outer end of the valve-stem N with a crankarm S, having its wrist-pin S engagingalongitudinally-extending guideway T, hung on the bell-crank levers U U, pivotally connected with each other by a link U", connected by a link U with a reversing-lever V, having the usual locking device V for looking the reversinglever in the desired position on the arched segment V Now when it is desired to turn the valve N for reversing the engine, as described, it is only necessary for the operator to swing the reversing-lever V over so as to move the guideway T downward, and-thereby impart a swinging motion to the crank-arm S to turn the valve N into the position shown-in Fig. 6. When the valve reaches this position, the port g is moved out of engagement with the channel (1 and the port it is moved in register with the channel (Z and the port 1 is moved in register with the channel a.

I do not limit myself to the particular construction of holding device employed forlocking the runs of the endless belt alternately to the reciprocating cross-head H, as said holding device may be varied. For instance, as shown in Figs. 8 and 9, I dispense with the clamping-jaws and employ brake-wheels and brake-bands for the same purpose. In the construction shown in Figs. 8 and 9 I provide the auxiliary piston-rod P witha crosshead Q connected at each end by a link Q with a lever W, on which are pivoted the ends of the brake-bands W W extending in opposite directions and windingon the brakewheels W W journaled in suitable bearings carried on the cross-head H. On the brake-wheels W W are formed or secured double pulleys W W, over which passes a run of the endless belt J, the said run also passing over guide-rollers L traveling on the cross-head H. Now when the piston moves in one direction the brake-bands W W of one holding device I are drawn in braking contact with the two Wheels W W to hold 7 the pulleys W W against rotation, so that brake-bands W W the corresponding run of the endless belt- J is locked to the cross-head H, while the other run is free to travelover the pulleys W W, left free to rotate, as their brake-wheels W W are not engaged by the corresponding Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A steam-engine comprising a cylinder, a piston reciprocating therein, a cross-head connected with the'pistoman endless belt,a main shaft carrying a pulley over which passes the belt, idlers over whichpasses the belt, holding devices on the said cross-head for alternately holding the runs of the belt to the cross-head, an auxiliary cylinder and a piston therein and actuating the holding devices in unison with the main piston, as set forth.

2. A steam-engine comprising a cylinder, a piston reciprocating therein, an endless belt, a cross-head through which pass the runs of said belt, the cross-head being connected with the piston-rod of said piston, a main shaft carrying a pulley over which pass the beltholding devices on said cross-head for alternately clampingthe runs of the belt to thecross -head, an auxiliary cylinder, a piston therein, and means controlled by the piston f the auxiliary cylinder for opening one holding device while closing the other,as set forth.

3. A steam'engine comprising a main cy1- inder, a main piston reciprocating therein, a cross-head carried byv the. piston-rod of said .set forth.

main piston, an endless belt extending-With its runs'through said cross-head,- a mainishaft carrying a pulley over which pass the belt.- holding devices on the cross-head for alternately locking the runs of the belt to the cross-, head, an auxiliary cylinder on the pistonrod, an auxiliary piston in the said auxiliary cylinder and having its piston-rod connected with the holding devices to open one while closing the other, and a valve for controlling the admission and exhaust of the motive agent to and from the auxiliary cylinder, as

4. A steam-engine comprising a main cylinder, a main piston reciprocating therein, a

cross-head carried by the piston-rod'of said main piston, an endless belt extending-with its runs through said cross-head, amain shaft carrying a pulley over which pass the beltholding devices on the cross-head for alternately locking the runs of the belt to the cross-head, an auxiliary cylinder on the piston-rod, an auxiliary piston in the said auxiliary cylinder and having its piston-rod connected with the holding'devices to open one while closing the other, a valve for controlling the admission and exhaust of the motive agent to and from the auxiliary cylinder, and manually-controlled means for reversing said valve, as set forth.

5. A steam-engine comprising a main cylinder, a main piston reciprocating therein, a

cross-head carried by the pistonrod of said main piston, an endless belt extending with it runs through said cross-head, a main shaft carrying a pulley over which pass the beltholding devices on the cross-head for alternately locking the runs of the belt to the cross-head, an auxiliary cylinder on the'piston-rod, an auxiliary piston in the saidauxiliary cylinder and having its piston-rod con nected with the holding devices to open one while closing the other, and a valve for controlling the admission and exhaust of the motive agent to and from the auxiliary cylinder, said main cylinder being connected by holding device for actuating the same, and a valve on the main piston-rod for controlling the admission andexhaust of the motive agent to and from the auxiliary cylinder by way of said channels, as set forth.

7. An engine provided with a holding mechanisin for an endless belt, and an actuating device for said holding mechanism and comprising an auxiliary cylinder, an auxiliary piston reciprocating therein, and a Valveforcontrolling the passage of the motive agent to and'fromsaid auxiliarycylinder, as set forth.

&

8. An engine provided with a holding mechanism foran endless belt, an actuating device for said holding mechanism and comprising an auxiliary cylinder, an auxiliary piston reciprocating therein, a valve for controlling the passage of the motive agent to and from said auxiliary cylinder, a crank-arm on said valve, a guide for said crank-arm, and a reversing-lever connected with said guide, as set forth.

9. An engine having an endless belt, a crosshead reciprocating in the direction of the length of the runs of the belt, a holding device carried by the cross-head and adapted to alternately lock the cross-head to the runs of the belt, the holding device comprising two sets of jaws, one for each run of the belt, levers and links connected with the jaws for opening and closing the same, and a cylinder moving in unison with the cross-head and having a piston connected by its piston-rod with said levers, as set forth.

10. An engine having an endless belt, a cross-head reciprocating in the direction of the length of the runs of the belt, a holding device carried by the crosshead and adapted to alternately lock the cross-head to the runs of the belt, the holding device comprising two sets of jaws, one for each run of the belt, 1evers and links connected with the jaws for opening and closing the same, and a cylinder moving in unison with the cross-head and having a piston connected by its piston-rod with said levers, said cylinder receiving its motive-agent supply from the main cylinder of the engine, as set forth.

11. An engine having an endless belt, a cross-head reciprocating in the direction of the length of the runs of the belt, a holding device carried by the cross-head and adapted to alternately lock the cross-head to the runs of the belt, the holding device comprising two sets of jaws, one for each run of the belt, levers and links connected with the jaws for opening and closing the same, a cylinder moving in unison with the cross-head and having a piston connected by its piston-rod with said levers, said cylinder receiving its motiveagent supply from the main cylinder of the engine, and a valve for controlling the admission and exhaust of the motive agent to and from the auxiliary cylinder from and to the said main cylinder, as set forth.

12. An engine having an endless belt, a cross-head reciprocating in the direction of the length of the runs of the belt, a holding device carried by the cross-head and adapted to alternately lock the cross-head to the runs of the belt, the holding device comprising two sets of jaws, one for each run of the belt, le-

vers and links connected with the jaws for opening and closing the same, a cylinder moving in unison with the cross-head and having a piston connected by its piston-rod with said levers,said cylinder receiving its motive-agent supply from the main cylinder of the engine, a valve for controlling the admission and exhaust of the motive agent to and from the auxiliary cylinder from and to the said main cylinder, and means for reversing said valve, as set forth.

13. In an engine, a main cylinder, a piston therein and provided in its rod with longitudinal ports opening on opposite sides of the piston, a cross-head, a valve-chamber to which the pistonrod is connected, an auxiliary cylinder secured to the cross-head and valve chamber, a piston in said auxiliary cylinder, a cable, holding devices for the cable, and a connection between the holding devices and piston of the auxiliary cylinder, as set forth.

14. In an engine, a main cylinder, a piston therein and provided in its rod with longitudinal ports opening on opposite sides of the piston,across-head, a valve-chamber to which the piston is secured, an auxiliary cylinder connecting the valve-chamber with the crosshead, a piston in the auxiliary cylinder, a valve in the valve-chamber, a cable, holding devices for the cable, and a connection be tween the holding devices and the piston of the auxiliary cylinder, as set forth.

15. In an engine,acylinder,a piston therein, an endless belt, a main shaft carrying a pul ley over which passes the belt, pivoted levers, sets of jaws, links connecting the levers with the jaws, an auxiliary cylinder, a piston in said cylinder and connected with said levers, and means for controlling the admission of the motive agent from the main cylinder to the auxiliary cylinder, as set forth.

16. In an engine,a cylinder,a piston therein, a cross-head, an endless belt, a main shaft carrying a pulley over which passes the belt, pivoted levers mounted on the cross-head, sets of jaws, links connecting the jaws with the levers, an auxiliary cylinder, a piston therein, a connection between the piston-rod of the piston of the auxiliary cylinder and the said levers, and means for controlling the admission of the motive agent from the main cylinder to the auxiliary cylinder, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PAUL S. BOS'IVVICK.

Witnesses:

J. H. BRYANS, II. M. BOSTWICK.

IIO 

